Improvement in plasterers  trowels



UNITED STATES PATENT OFFICEo CHARLES DISSTON, 0F PHILADELPHIA,PENNSYLVANIA.

IMPROVEMENT lN PLASTERERS TROWELS.

Specilication forming part cf Leiters Patent No. 52.355, dated April 0,1875 application filed February 16, 1875.

To all 'whom fit may concern:

Be it known that I, CHARLES DissToN, of Philadelphia, Pennsylvania, haveinvented an Improvement in Plasterers Trowels, of which the following isa specification:

The object of my invention is to make the I will now proceed todescribe, reference being had to the accompanying drawing', in which-Figure l is a transverse section ofthe blade Vof an ordinary trowel forplasterers; Fig. 2, a

side view of my improved trowel; Fig. 3, a transverse section ou theline l 2, and Fig. 4 a perspective view of the blade.

In making plasterers7 trowels, it* has been usual to take a blade ofsteel of uniform thick ness, rivet it to the frame B of the handle, andthen grind and polish the surface. Asfit is essential that the bladeshould be thin, the countersunltheads a ofthe rivets, as shown in thesectional veiligl, hadnJ very insecure hold ofthe blade, which wasliable to be detached-a difficulty which I overcomein the followingmanner: The handle consists, as usual, of a metalfi'layge, B, ofmalleable cast-iron, this frame having a tang onto which is driventhe`wooden gripa@ rlhe blade A, instead ofbeing ot"u'niform thickness,is reenforced by a longitudinal rib, situated midway between theopposite edges of the blades, the rib being of the same width aspen, it'desired, wider than, the lower portion of the frame B. Instead of therib terminating4 abruptly at the ends x x of the frame, I prefer toreduce it in thickness until it emerges into the upper surface oftheblade, at or near each end of the same. This re-ent'oroing rib formspart ofthe blade, and may be most readily formed on the same by theprocess of rolling the blade and rib simultaneously. The frame B isiitted to the rib ebend is secured to the same, in the present instance,by three rivets. (Shown by dotted lines n1 Fig. 2.5 ltwill'be evidentthat the rib will permit the use of substantial heads for the rivets,which will have a more secure hold of the blade than ot a bladewyhich isof uniform th lckness throughout, and in connection with which rivetswith very slight heads must be used; at the same time the rib in no wayinterferes with the special requirement of the trowel, that is a thinblade.

I claim as my invention and as a new manufacture- A plasterers trowelhaving a blade re-enforced by a central longitudinal rib, e, adapted tothe frame B of the handle, all substantially as set forth. N

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES DISSTON. Witnesses z HARRY SMITH, HUBERT HowsoN.

